TPS922052: TPS922052 Consultation

Dear Vayne,

Thanks for reaching out! Could you pls kindly help share with us:

(1) Input voltage range: 9-12.6V; 

(2) LED string quantities and LED string forward voltage; LED current;

(3) Dimming ratio and dimming method like Analog dimming or PWM dimming.

Thank you!

BRs

Lucia

Hi Lucia,

The customer has a typical working voltage of 350mA and 1.5V for a single lamp, with 4 in series and 4 in parallel, totaling 16 lamps.

Hi Vayne,

(1) Do you need separate control for each LED string? 

(2) So from my understanding, total LED string forward voltage is 1.5V*4=6V; LED current is 350mA. Vin range is 9-12.6V, I would recommend TPS922050. BTW, may I know customer and EE and could you discuss by email (lucia-gao@ti.com)?

BRs

Lucia

Hi Lucia,

Okay,

I will disscuss this by email,also cc the customer

No problem.

BRs

Lucia

Hi Lucia,

IRLED-0725.pdf

The customer has drawn a schematic diagram, can you help review it?

Hi Vayne,

Do you need fault function? A pullup resistor of 10 kΩ is recommended to pull it up to a 5-V voltage.

For the design of CSPN, pls refer to [FAQ] How to design the CSP and CSN pin components for TPS922055 / TPS922054 / TPS922053 / TPS922052?

For the design of UVP resistor, pls refer to [FAQ] How to design the UVP resistor divider for TPS922055 / TPS922054 / TPS922053 / TPS922052?

BRs

Lucia

.

Hi Lucia,

Mainly considering the current of the LED, they are connected in parallel with 4 channels, and the maximum current of the lamp can reach 1A, so they still chose 054.

Hi Lucia,

What value should be chosen for this resistor for 054?

Hi Vayne,

It depends on how much LED current you need. Thank you!

BRs

Lucia

Hi Lucia,

Okay,

The customer wants to apply for an EVM for testing, but there is no 054 board on the official website. Do we need to apply for 055 for this one?